ETYM French calibre, perh. from Latin qualibra of what pound, of what weight; hence, of what size, applied first to a ball or bullet; cf. also Arabic qâlib model, mold. Related to Calipers, Calivere.
(Alternate spelling: calibre).
1. The diameter of a cylinder, such as the barrel of a rifle.
2. Quality or value.

A handheld instrument used for rapid calculations; have been replaced by pocket calculators; SYN. slipstick.
Mathematical instrument with pairs of logarithmic sliding scales, used for rapid calculations, including multiplication, division, and the extraction of square roots. It has been largely superseded by the electronic calculator.
It was invented 1622 by the English mathematician William Oughtred. A later version was devised by the French army officer Amédée Mannheim (1831–1906). + prikaži više

A caliper with a vernier scale for very fine measurements; SYN. vernier micrometer.
A measuring device that consists of a main scale with a fixed jaw and a sliding jaw with an attached vernier.